Tempstar Defrost Control Board for T2H336GKD100 — Heat Pump | Ships Today
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Overview
This is the genuine OEM defrost control board (part #1173636) for the Tempstar T2H336GKD100 heat pump. The defrost board is the brain of the outdoor unit during heating: it monitors coil temperature and run time, then commands a defrost cycle to melt frost from the outdoor coil by reversing the system and shutting off the condenser fan. It also coordinates the reversing valve, compressor, and auxiliary heat. When the board fails, the heat pump may ice over and lose heating capacity, run defrost too often or never, leave the fan running during defrost, or fail to switch between heating and cooling. A faulty defrost board often mimics refrigerant or sensor problems, so accurate diagnosis saves time and money.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | Tempstar (ICP / Heil / Comfortmaker family) |
| Control Voltage | 24V |
| Application | Heat pump outdoor unit defrost control |
| Fitment | OEM |
Compatibility
Built as the factory replacement for the Tempstar T2H336GKD100 heat pump. Because the ICP family shares control electronics, this defrost board frequently fits comparable Heil, Comfortmaker, and ICP heat pumps. Match the part number and connector layout to your existing board before installing.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the outdoor unit control panel cover.
- Document — Photograph every connector, the defrost sensor lead, and the timing/jumper settings before disconnecting.
- Remove — Unplug each harness, release the standoffs or screws, and lift out the old board.
- Install — Mount the new board, set defrost timing jumpers to match, and reconnect every harness per your photo.
- Test — Restore power, initiate a forced defrost, and confirm the reversing valve, compressor, and fan respond correctly.
Signs You Need a Replacement
- Outdoor coil ices over and heating capacity drops
- Defrost cycle runs constantly or never initiates
- Fan runs during defrost or stays off when it shouldn't
- No response from the reversing valve or compressor on a call
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days